This document discusses various aspects of color including: - The four main properties of color - hue, saturation, temperature, and value - Different color harmony schemes for combining colors such as monochromatic, analogous, complementary, split complementary, triadic, and tetradic - How color is additive in RGB and subtractive in CMYK - The phenomenon of simultaneous contrast where the perception of a color is affected by surrounding colors - Sociological meanings and associations that different cultures attach to various colors